diff --git a/README.md b/README.md
index d63f27f..0c4354d 100644
--- a/README.md
+++ b/README.md
@@ -120,7 +120,7 @@ I also created a nice little command line tool called [mmon][mmon-github-url]  (
 | si.version() | : string | X | X | X | X | X | lib version (no callback/promise) |
 | si.time() | {...} | X | X | X | X | X | (no callback/promise) |
 | | current | X | X | X | X | X | local (server) time |
-| | uptime | X | X | X | X | X | uptime |
+| | uptime | X | X | X | X | X | uptime in number of seconds |
 | | timezone | X | X | X | X | X | e.g. GMT+0200 |
 | | timezoneName | X | X | X | X | X | e.g. CEST |
 
diff --git a/docs/general.html b/docs/general.html
index 15ec553..b6f7e50 100644
--- a/docs/general.html
+++ b/docs/general.html
@@ -103,7 +103,7 @@
                     <td>X</td>
                     <td>X</td>
                     <td>X</td>
-                    <td>uptime</td>
+                    <td>uptime in number of seconds</td>
                   </tr>
                   <tr>
                     <td></td>